I used Battery Eater Pro 2.7 to assess the Eee 1000HE's battery life. With the ASUS Hybrid Engine power control set to Power Saving mode, the 1000HE ran for 6 hours and 46 minutes. That is very good, considering that Battery Eater Pro regularly exercises both the CPU and primary hard disk drive. During the test, the Atom N280 ran at about 1.3GHz, as opposed to its normal 1.66GHz speed. ASUS says 9.5 hours of battery life are possible with the 1000HE, but that is under very special conditions.
Note above that Battery Eater Pro measured the actual charged capacity of the 1000HE’s battery at 59400 mWh and its voltage at 6.5V, leading to a mAh rating of 9139 (59400/6.5).